How to scale the scene relative to an objects metric values?
This is probably a duplicate, but I couldn't find any answer right now.

Scale all objects simultaneously towards a common center (the 3D cursor).


Position the 3D cursor at the common center. This can simply be the origin of the scene. To place the 3D cursor at the scene origin (0, 0, 0), press &#8679; ShiftS and select Cursor to Center.
&#8679; ShiftRMB select the objects you wish to rescale.
Note, that the dimension values take all selected objects into account not just the active one.
Set the 3D cursor as the pivot point with the shortcut NumpadPeriod or via the 3D view's menu.

Rescale with S, then enter the desired value (e.g. 0.01) and press &#9166; Enter to confirm.
You will have to calculate this value beforehand by dividing the desired measurement with the current measure. E.g. If you table has a dimension[0] of 1.5 and you want it to be 2, your scaling value will be 2 / 1.5 = 1.333. This can be done during the scaling operation.
Press S 2 * /1.5 and confirm with Enter.
Apply the scale of the objects by pressing &#9096; CtrlA and choose Scale.